Wednesday, March 17, 2010 - 10:59 am, by: David Barnes(Toyota_celsior)
Every celsior I have own has had start stumble, Cleaning the idle control valve always helps. But never eliminated the problem.
Still remove and clean idle control valve.
Also soarer boys get this problem all the time, fuel pump ecu plays up, can be tells if thats the problem by bridging some terminals in the diagnosis port. (not sure which one, quick seach on this site would tell you) But that is not a fix, just a way to tell if its not working as it should, you will still require a replacement fuel pump ecu for saftey reasons.